Effect of tempering temperature on microstructure and properties of bainitic wear-resistant steel

doi:10.13251/j.issn.0254-6051.2023.03.014

Abstract

Abstract: Microstructure evolution and properties of bainitic wear-resistant steel produced by thermo-mechanical control process (TMCP) + tempering at different temperatures were studied. The results show that after TMCP and tempering at 200 ℃, an ideal carbide-free bainite/martensite complex structure is obtained, which contains 8.7vol% retained austenite. The optimal combination of strength and toughness is obtained under this process. The yield strength and tensile strength reach 1172 MPa and 1613 MPa, the elongation after fracture reaches 19.4%, and the impact absorbed energy at -20 ℃ is 47 J, and the hardness can meet the performance requirements of NM500 level. After tempering at 520 ℃, a large number of coarse carbides precipitate, and retained austenite almost decomposes completely, resulting in the decrease of strength and toughness of the steel.

Key words: bainitic wear-resistant steel, thermo-mechanical control process(TMCP), tempering temperature, retained austenite

CLC Number:

TG142.72

Wang Kaikai, Ma Longteng, Luo Ping, Liu Meiyan, Lu Shiping, Di Guobiao, Wang Yanfeng, Ma Changwen. Effect of tempering temperature on microstructure and properties of bainitic wear-resistant steel[J]. Heat Treatment of Metals, 2023, 48(3): 84-90.

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